Resilient connecting means for lifting vibratory device

Abstract

An improved vehicle-mounted lifting apparatus for a vibratory device. The apparatus includes bearings in which a principal pivot shaft is journaled, a lifting link and at least one center-bonded joint spaced along and nonrotatably mounted on the pivot shaft, a lift cylinder secured to the vehicle and extending to the lifting link, and a rigid arm extending from each center-bonded joint to a support for the vibratory device. Although a compact simplified lifting structure, excellent vibratory isolation to protect the lift cylinder is provided.

What is claimed: 
     
       1. Lifting apparatus for a vehicle-mounted vibratory device secured on a vibratory-device support, comprising: a shaft rotatably mounted with respect to the vehicle;   a rigid lifting link affixed to and extending radially from the shaft;   a lift cylinder anchored at one end with respect to the vehicle and extending to the lifting link;   a center-bonded joint affixed to the shaft in position spaced from the lifting link; and   a rigid arm having a proximal end and a distal end, the proximal end connected to the center-bonded joint and the distal end connected to the vibratory-device support such that during lifting and suspension the weight of the vibratory device and support is applied as torque in the center-bonded joint, thereby providing both lift and vibratory isolation through a single element.     
     
     
       2. The apparatus of claim 1 wherein there are a plurality of said center-bonded joints on the shaft and a plurality of said rigid arms. 
     
     
       3. The apparatus of claim 2 wherein the plurality of center-bonded joints includes two center-bonded joints spaced on the shaft. 
     
     
       4. The apparatus of claim 2 further comprising: a second bearing means fixed with respect to the vehicle;   a second shaft journaled in the second bearing means;   a second lifting link nonrotatably mounted on and extending from the second shaft;   means linking the lifting links such that they move in tandem under the control of the cylinder;   at least one additional center-bonded joint nonrotatably mounted on the second shaft; and   at least one additional rigid arm each connected at one end to one of the additional center-bonded joints and at the other end to the support for the vibratory device.   
     
     
       5. The apparatus of claim 4 wherein there are a pair of the center-bonded joints on each of the two shafts and for each such joint one of the rigid arms.